TM 55-2210-223-12TO 45A2-2-14-412-23. LOAD LIMITSa.Keep the locomotive within proper load limits.The load meter is connected to measure one-half the output of the main generator. Thecontinuous operating limit of the locomotive is1200 amperes (600 on meter). Any reading ofthe load meter in excess of the continuousoperating limit indicates an overload.b.Operation in overload range is permissible aslong as the following time limits are notexceeded:RangeTime0 to 1200 amperes (0 to 600 on meter)Continuously1200 to 1400 amperes (600 to 700 on meter)20 min1400 to 1600 amperes (700 to 800 on meter)10 min1600 to 1920 amperes (800 to 960 on meter)5 minc.When the time limit for that overload range is reached, the generator and motors are at their maximum allowabletemperature; to avoid severe damage from overheating, allow excess heat to dissipate by one of the followingmethods:(1)With load cut off and engine idling, allow a cooling period of 15 to 30 minutes, after which operation in anyone of the overload ranges is again permitted with cooling period to follow.(2)Reduce load to continuous range on the dial and continue operation in this range.2-24. GROUND RELAY ACTIONCAUTIONRepeated tripping of the ground relay, accompaniedby unusual noises such as continuous thumping orsquealing, may also be an indication of serioustraction motor trouble that must be investigated atonce.a.If a ground occurs in the high voltage circuit, the ground relay will trip and the engine will return to idle.2-39